GitHub - ihciah/go-shadowsocks-magic: A shadowsocks implementation in golang wit...
source link: https://github.com/ihciah/go-shadowsocks-magic
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README.md
go-shadowsocks-magic
A shadowsocks implementation in golang with Multi-connection Acceleration.
The code is based on https://github.com/shadowsocks/go-shadowsocks2
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Features
- SOCKS5 proxy with UDP Associate
- Support for Netfilter TCP redirect (IPv6 should work but not tested)
- UDP tunneling (e.g. relay DNS packets)
- TCP tunneling (e.g. benchmark with iperf3)
- Multi-connection Acceleration
Multi-connection Acceleration Protocol
In the original shadowsocks protocal, the data is transmitted in the following way:
client <---> ss-local <--[encrypted]--> ss-remote <---> target
The shadowsocks is used to access blocked servers.
In most common applications, the bottleneck of the bandwidth is the way outside their countries: ss-local<--->ss-remote
.
Is it the best way to communicate in one connection?
With a proper protocol, the ss-local
and ss-remote
can communicate in multi TCP connections,
which will be faster when transferring a large amount of data, especially for those slow VPS.
The following protocol by ihciah is one of them. The implementation in other language is welcome.
-
Establish the connection to shadowsocks server first.
-
Send address. Here I add 2 bits for "Magic":
magic-main
(0b01000
) andmagic-child
(0b10000
).After sending the address with
magic-main
, the server will reply a 16-bytedataKey
. -
Up till now we have 1 connection. Through the connection, data will be sent back in format
[BlockID(uint32)][BlockSize(uint32)][Data([BlckSize]byte)]
. -
Of course, it's not acceleration with only 1 connection. With the
dataKey
we can construct an "address" in format[Type([1]byte)][dataKey([16]byte)]
, the type must be marked asmagic-child
.Now create a new connection and send the 17-byte "address", then the data will be transmitted to the client.
-
Once the main connection(the first one) is disconnected, all the other connections will die. However, it's not a problem if the
magic-child
connections interrupted.
Install
Pre-built binaries for common platforms are available at https://github.com/ihciah/go-shadowsocks-magic/releases
Install from source
go get -u -v github.com/ihciah/go-shadowsocks-magic
Basic Usage
Server
Start a server listening on port 8488 using RC4-MD5
cipher with password your-password
.
shadowsocks-magic -s 'ss://RC4-MD5:your-password@:8488' -verbose
When deploy, you can close verbose.
Client
Start a client connecting to the above server. The client listens on port 1080 for incoming SOCKS5 connections, and tunnels both UDP and TCP on port 8053 and port 8054 to 8.8.8.8:53 and 8.8.4.4:53 respectively.
shadowsocks-magic -c 'ss://RC4-MD5:your-password@[server_address]:8488' \
-verbose -socks :1080 -u -udptun :8053=8.8.8.8:53,:8054=8.8.4.4:53 \
-tcptun :8053=8.8.8.8:53,:8054=8.8.4.4:53
Replace [server_address]
with the server's public address.
Advanced Usage
Netfilter TCP redirect (Linux only)
The client offers -redir
and -redir6
(for IPv6) options to handle TCP connections
redirected by Netfilter on Linux. The feature works similar to ss-redir
from shadowsocks-libev
.
Start a client listening on port 1082 for redirected TCP connections and port 1083 for redirected TCP IPv6 connections.
shadowsocks-magic -c 'ss://RC4-MD5:your-password@[server_address]:8488' -redir :1082 -redir6 :1083
TCP tunneling
The client offers -tcptun [local_addr]:[local_port]=[remote_addr]:[remote_port]
option to tunnel TCP.
For example it can be used to proxy iperf3 for benchmarking.
Start iperf3 on the same machine with the server.
iperf3 -s
By default iperf3 listens on port 5201.
Start a client on the same machine with the server. The client listens on port 1090 for incoming connections and tunnels to localhost:5201 where iperf3 is listening.
shadowsocks-magic -c 'ss://RC4-MD5:your-password@[server_address]:8488' -tcptun :1090=localhost:5201
Start iperf3 client to connect to the tunneld port instead
iperf3 -c localhost -p 1090
Design Principles
The code base strives to
- be idiomatic Go and well organized;
- use fewer external dependences as reasonably possible;
- only include proven modern ciphers;
Known Issues
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